Ideally you want to use rescue cat or obedience schooled to summon 2 or 3 beasts from the deck, then go straight into forest, or if you have a beast in the hand and you used rescue cat, go into bujinki > forest > search hide n seek (maybe pop a backrow if going second)> shuffle monsters then draw a card
Below I'll justify some of my choices
-Bujinki Ahashima: as long as you aren't restricted to beast types only, you can go into this and get a rank 2 (usally merfae of the forest) and then get to pop backrow when you use forest's effect to search
-Closed Forest: the only decent beast oriented field spell; prevents mystic mine, zombie world, lair of darkness from being activated and screwing you over (because if they do get on the field you are screwed)
-Spirtial forest:a good back up card, since a lot of your cards have low attack and you won't always be able to return a merfae to the hand
-super rush recklessly:basically lets you return a card to the deck for free if hide and seek is on the field, and then you can either return the target to the hand, or absorb it into mammy
-rapid red rushing hare: can special summon itself in an empty column, but is effect to destroy itself if something is place in the same column doesn't work if hide and seek is on the field. Can be used for going into leo, missus radius, and daruma doll
-the naturias:beast is an obvious choice, but you might have to go a little out of your way to summon him. Barkion is there just for exterio, and to give valfawn some use. I feel like if you get the right amount of resources you can try and summon Exterio traditionally.
-miracle synchro fusion draws a card if destoryed so it can be used for baiting backrow destuction. You could replace one of the copies with waking the dragon instead.